LLVMCheckLinkerFlag.cmake

include(CheckLinkerFlag OPTIONAL)

if (COMMAND check_linker_flag)
 macro(llvm_check_linker_flag)
 check_linker_flag(${ARGN})
 endmacro()
else()
# Until the minimum CMAKE version is 3.18

 include(CheckCXXCompilerFlag)
 include(CMakePushCheckState)

# cmake builtin compatible, except we assume lang is C or CXX
 function(llvm_check_linker_flag lang flag out_var)
 cmake_policy(PUSH)
 cmake_policy(SET CMP0056 NEW)
 cmake_push_check_state()
 set(CMAKE_EXE_LINKER_FLAGS"${CMAKE_EXE_LINKER_FLAGS}${flag}")
 if("${lang}"STREQUAL"C")
 check_c_compiler_flag(""${out_var})
 elseif("${lang}"STREQUAL"CXX")
 check_cxx_compiler_flag(""${out_var})
 else()
 message(FATAL_ERROR "\"${lang}\" is not C or CXX")
 endif()
 cmake_pop_check_state()
 cmake_policy(POP)
 endfunction()
endif()